/* Copyright (c) 2020 XEPIC Corporation Limited */
/*
 * Copyright (c) 2012-2019 Stephen Williams (steve@icarus.com)
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA.
 */

#include <assert.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>

#include "sys_priv.h"

static PLI_INT32 one_string_arg_compiletf(ICARUS_VPI_CONST PLI_BYTE8* name) {
  vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
  vpiHandle argv;
  vpiHandle arg;

  argv = vpi_iterate(vpiArgument, callh);
  if (argv == 0) {
    vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
               (int)vpi_get(vpiLineNo, callh));
    vpi_printf("%s requires a string argument.\n", name);
    vpi_control(vpiFinish, 1);
    return 0;
  }

  arg = vpi_scan(argv);
  if (arg == 0) return 0;

  arg = vpi_scan(argv);
  if (arg != 0) {
    vpi_printf("ERROR: %s:%d: ", vpi_get_str(vpiFile, callh),
               (int)vpi_get(vpiLineNo, callh));
    vpi_printf("%s has too many arguments.\n", name);
    vpi_control(vpiFinish, 1);
    return 0;
  }

  return 0;
}

static PLI_INT32 len_calltf(ICARUS_VPI_CONST PLI_BYTE8* name) {
  vpiHandle callh = vpi_handle(vpiSysTfCall, 0);
  vpiHandle argv;
  vpiHandle arg;

  (void)name; /* Parameter is not used. */

  argv = vpi_iterate(vpiArgument, callh);
  assert(argv);
  arg = vpi_scan(argv);
  assert(arg);
  vpi_free_object(argv);

  int res = vpi_get(vpiSize, arg);

  s_vpi_value value;
  value.format = vpiIntVal;
  value.value.integer = res;

  vpi_put_value(callh, &value, 0, vpiNoDelay);

  return 0;
}

void v2009_string_register(void) {
  s_vpi_systf_data tf_data;
  vpiHandle res;

  tf_data.type = vpiSysFunc;
  tf_data.sysfunctype = vpiIntFunc;
  tf_data.tfname = "$ivl_string_method$len";
  tf_data.calltf = len_calltf;
  tf_data.compiletf = one_string_arg_compiletf;
  tf_data.sizetf = 0;
  tf_data.user_data = "$ivl_string_method$len";
  res = vpi_register_systf(&tf_data);
  vpip_make_systf_system_defined(res);
}
